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Frankenstein JBLE EVOi324s
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<blockquote data-quote="Phil Graham" data-source="post: 31361" data-attributes="member: 430"><p>Re: Frankenstein JBLE EVOi324s</p><p></p><p></p><p></p><p>Mike,</p><p></p><p>If you roll one of the woofers off, the group delay introduced will most likely deleteriously affect the polar response. Not only are you rolling off the woofer, you are also introducing a group delay as a consequence of the choke.</p><p></p><p>In the stopband the group delay will be nearly constant, but in the transition band it is not constant, and will pull the polar response "down" towards the woofer with the choke.</p><p></p><p>This is a fairly involved topic, and one I don't have the time to elaborate on today, but I recommend both Charlie Hughes' <a href="https://docs.google.com/viewer?url=http%3A%2F%2Fwww.excelsior-audio.com%2FPublications%2FUsing_All_Pass_Filters_to_Improve_Directivity_Response.pdf" target="_blank">article</a> and <a href="http://www.excelsior-audio.com/Publications/Hughes_-_Loudspeaker_Directivity_Improvement_Using_Low_Pass_&_All_Pass_Filters_(AES125,_2008-10).pdf" target="_blank">AES paper</a> on this topic.</p><p></p><p>With your extensive background in electronics it all should be pretty intuitive.</p></blockquote><p></p>
[QUOTE="Phil Graham, post: 31361, member: 430"] Re: Frankenstein JBLE EVOi324s Mike, If you roll one of the woofers off, the group delay introduced will most likely deleteriously affect the polar response. Not only are you rolling off the woofer, you are also introducing a group delay as a consequence of the choke. In the stopband the group delay will be nearly constant, but in the transition band it is not constant, and will pull the polar response "down" towards the woofer with the choke. This is a fairly involved topic, and one I don't have the time to elaborate on today, but I recommend both Charlie Hughes' [URL="https://docs.google.com/viewer?url=http%3A%2F%2Fwww.excelsior-audio.com%2FPublications%2FUsing_All_Pass_Filters_to_Improve_Directivity_Response.pdf"]article[/URL] and [URL="http://www.excelsior-audio.com/Publications/Hughes_-_Loudspeaker_Directivity_Improvement_Using_Low_Pass_&_All_Pass_Filters_(AES125,_2008-10).pdf"]AES paper[/URL] on this topic. With your extensive background in electronics it all should be pretty intuitive. [/QUOTE]
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